A flexible repair material for trenchless pipelines and a preparation method thereof

Abstract

The present invention relates to the field of trenchless pipeline repair materials, and specifically to a flexible repair material for trenchless pipelines and a preparation method thereof, which are used to solve the problems of poor mechanical properties, repair effects and chemical corrosion resistance of existing trenchless pipeline repair materials. The preparation method uses interpenetrating network self-repairing polyurethane as the main raw material, so that the repair material has excellent flexibility, can adapt to various deformations of the pipeline during use, reduce damage to the repaired part caused by deformation, and has excellent corrosion resistance and automatic repair effect, extending the service life of the material. Adding epoxy resin to the material can increase the degree of cross-linking and effectively improve the mechanical properties of the repair material. Adding polydopamine-coated molybdenum disulfide nanosheets can further improve the mechanical properties of the repair material, further improve the corrosion resistance of the repair material, and improve the stability of the repair material in complex chemical environments.

Description

Technical Field

[0001] The present invention relates to the field of trenchless pipeline repair materials, and in particular to a flexible repair material for trenchless pipelines and a preparation method thereof. Background Art

[0002] In urban underground pipeline systems, due to long-term exposure to factors such as chemical corrosion, physical wear, geological movement, and fluid erosion, pipelines suffer varying degrees of damage, such as cracks, leaks, and corrosion. Traditional pipeline repair methods typically require excavation, significantly impacting traffic, the environment, and surrounding facilities. Repairs are also costly and time-consuming. Trenchless pipeline repair technology, as an advanced repair method, has been widely adopted due to its advantages of minimal ground disturbance, rapid construction, and low cost.

[0003] However, existing trenchless pipeline repair materials still have some shortcomings. For example, some repair materials have poor mechanical properties, making them difficult to adapt to the deformation and impact of pipeline use, which can easily cause damage. Moreover, even minor damage to the pipeline cannot be repaired automatically, which affects the repair effect and service life. Moreover, existing repair materials have poor chemical resistance and are prone to corrosion and damage, making them difficult to meet the requirements of long-term use in complex environments.

[0004] Therefore, developing a flexible repair material for trenchless pipelines and a preparation method thereof has important practical significance. Summary of the Invention

[0005] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide a flexible repair material for trenchless pipelines and a preparation method thereof, which solves the problem that the existing trenchless pipeline repair materials have poor mechanical properties, repair effects and chemical corrosion resistance, and are difficult to meet the long-term use requirements in complex environments.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A flexible repair material for trenchless pipelines, comprising the following components in parts by weight:

[0008] 40-50 parts of interpenetrating network self-healing polyurethane, 5-7 parts of epoxy resin, 2-12 parts of polydopamine-coated molybdenum disulfide nanosheets, 2-6 parts of plasticizer, 1-5 parts of talc, 0.5-1.5 parts of antioxidant and 0.3-0.5 parts of ultraviolet absorber;

[0009] The interpenetrating network self-repairing polyurethane is prepared by the following steps:

[0010] Step a1: Add polytetrahydrofuran diol, isophorone diisocyanate, dibutyltin dilaurate and N,N-dimethylacetamide to a three-necked flask equipped with a stirrer and a thermometer, stir and react for 10-20 minutes at a temperature of 25-30°C and a stirring rate of 200-300r / min, then heat to 60-65°C and continue stirring and reacting for 1-2 hours, then heat to 80-85°C and continue stirring and reacting for 2-3 hours, then add 2,2'-diaminodiphenyl disulfide and continue stirring and reacting for 1-2 hours, then cool to 40-45°C and add triethylamine to adjust the pH to 6-6.5, then add deionized water and continue stirring and reacting for 40-50 minutes, and adjust the solid content to 40% to obtain a self-repairing polyurethane emulsion;

[0011] Step a2: Add the self-healing polyurethane emulsion, methyl methacrylate, butyl acrylate, divinyl fluorine-containing crosslinker and emulsifier to a three-necked flask equipped with a stirrer and a thermometer, and stir the reaction at a temperature of 25-30°C and a stirring rate of 200-300r / min for 10-20min, then heat the temperature to 70-75°C and continue stirring the reaction for 1-2h, then add azobisisobutyronitrile and continue stirring the reaction for 6-8h. After the reaction is completed, the reaction product is cooled to room temperature, poured into a mold, and then placed in a vacuum drying oven and dried at a temperature of 60-65°C for 6-12h to obtain an interpenetrating network self-healing polyurethane.

[0012] As a further embodiment of the present invention: the usage ratio of the polytetramethylene glycol, isophorone diisocyanate, dibutyltin dilaurate, N,N-dimethylacetamide and 2,2'-diaminodiphenyl disulfide in step a1 is 20-25 g: 11-13 g: 0.05-0.15 g: 30-35 mL: 3-7 g.

[0013] As a further scheme of the present invention: the described polytetrahydrofuran diol in step a1 is PTMG-1000.

[0014] As a further solution of the present invention: the usage ratio of the self-healing polyurethane emulsion, methyl methacrylate, butyl acrylate, divinyl fluorine-containing crosslinker, emulsifier and azobisisobutyronitrile in step a2 is 90-100g:7-11g:12-16g:0.5-4.5g:1-3g:0.3-0.5g.

[0015] As a further solution of the present invention: the emulsifier in step a2 is a mixture of SDS emulsifier and NP-10 emulsifier in a mass ratio of 1:2.

[0016] As a further embodiment of the present invention: the divinyl fluorine-containing crosslinking agent is prepared by the following steps:

[0017] Octafluoro-1,6-hexanediol, triethylamine and anhydrous acetone are added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and the mixture is stirred and reacted for 20-30 minutes at a temperature of -10-0°C and a stirring rate of 200-300 r / min. Then, acryloyl chloride solution is added dropwise while stirring, and the dropping rate is controlled to be 1-2 drops / s. After the dropwise addition is completed, the mixture is heated to 5-10°C and the stirring reaction is continued for 2-3 hours, and then the mixture is heated to 30-35°C and the stirring reaction is continued for 4-5 hours. After the reaction is completed, the reaction product is cooled to room temperature, and then the solvent is removed by rotary evaporation. The mixture is then washed with distilled water 2-3 times, and then extracted with dichloromethane 2-3 times. The extracts are combined and the solvent is removed by rotary evaporation to obtain a divinyl fluorine-containing crosslinker.

[0018] As a further solution of the present invention: the usage ratio of octafluoro-1,6-hexanediol, triethylamine, anhydrous acetone and acryloyl chloride solution is 10 mmol: 25-30 mmol: 70-80 mL: 20-22 mL.

[0019] As a further solution of the present invention: the acryloyl chloride solution is a solution in which acryloyl chloride is dissolved in anhydrous acetone at a ratio of 10 mmol:10 mL.

[0020] As a further solution of the present invention: the polydopamine-coated molybdenum disulfide nanosheets are prepared by the following steps:

[0021] Step b1: adding ammonium molybdate, thiourea and deionized water to a three-necked flask equipped with a stirrer and a thermometer, stirring the reaction at a temperature of 25-30°C and a stirring rate of 200-300 r / min for 20-30 minutes, then heating to 200-220°C and continuing to stir the reaction for 15-20 hours. After the reaction is completed, the reaction product is cooled to room temperature and then centrifuged. The precipitate is washed with distilled water and anhydrous ethanol 2-3 times in sequence, and then placed in a vacuum drying oven and dried at a temperature of 60-65°C for 3-5 hours to obtain molybdenum disulfide nanosheets;

[0022] Step b2: Add molybdenum disulfide nanosheets and Tris-HCl buffer solution to a three-necked flask equipped with a stirrer and a thermometer, stir and react for 20-30 minutes at a temperature of 25-30°C and a stirring rate of 200-300 r / min, then add dopamine hydrochloride and continue stirring and reacting for 25-30 hours. After the reaction is completed, centrifuge the reaction product, wash the precipitate with distilled water 2-3 times, and then place it in a vacuum drying oven and dry it at a temperature of 60-65°C for 3-5 hours to obtain polydopamine-coated molybdenum disulfide nanosheets.

[0023] As a further solution of the present invention: the usage ratio of the ammonium molybdate, thiourea and deionized water in step b1 is 2.47 g:4.56 g:50-60 mL.

[0024] As a further solution of the present invention: the usage ratio of the molybdenum disulfide nanosheets, Tris-HCl buffer solution and dopamine hydrochloride in step b2 is 1 g:90-100 mL:0.4-0.5 g.

[0025] As a further solution of the present invention: the molar concentration of the Tris-HCl buffer solution in step b2 is 1 mol / L and the pH is 8.5.

[0026] As a further solution of the present invention: a method for preparing a flexible repair material for a trenchless pipeline comprises the following steps:

[0027] Step 1: Weigh 40-50 parts of interpenetrating network self-healing polyurethane, 5-7 parts of epoxy resin, 2-12 parts of polydopamine-coated molybdenum disulfide nanosheets, 2-6 parts of plasticizer, 1-5 parts of talc, 0.5-1.5 parts of antioxidant and 0.3-0.5 parts of ultraviolet absorber according to weight parts and set aside;

[0028] Step 2: Add interpenetrating network self-healing polyurethane, epoxy resin, polydopamine-coated molybdenum disulfide nanosheets, plasticizer, talc, antioxidant and ultraviolet absorber into a mixer, stir and react for 20-30 minutes at a temperature of 25-30°C and a stirring rate of 800-1000r / min to obtain a flexible repair material for non-excavation pipelines.

[0029] As a further solution of the present invention: the epoxy resin is epoxy resin E-51.

[0030] As a further solution of the present invention: the plasticizer is dioctyl phthalate.

[0031] As a further embodiment of the present invention: the antioxidant is antioxidant 168.

[0032] As a further solution of the present invention: the ultraviolet absorber is ultraviolet absorber UV-329.

[0033] Beneficial effects of the present invention:

[0034] The present invention discloses a flexible repair material for trenchless pipelines and a preparation method thereof. The flexible repair material for trenchless pipelines is obtained by adding interpenetrating network self-repairing polyurethane, epoxy resin, polydopamine-coated molybdenum disulfide nanosheets, a plasticizer, talcum powder, an antioxidant, and an ultraviolet absorber into a mixer and stirring and mixing. The preparation method uses the interpenetrating network self-repairing polyurethane as a main raw material, so that the repair material has excellent flexibility, can adapt to various deformations of the pipeline during use, reduces damage to the repaired part caused by deformation, has excellent corrosion resistance, and has an automatic repair effect, extending the service life of the material. Adding epoxy resin thereto can increase the degree of cross-linking and effectively improve the mechanical properties of the repair material. Adding polydopamine-coated molybdenum disulfide nanosheets can further improve the mechanical properties of the repair material and further improve the corrosion resistance of the repair material. The repair material can effectively resist erosion by corrosive media such as acids, alkalis, and salts, and improve the stability of the repair material in complex chemical environments.

[0035] In the process of preparing flexible repair materials for trenchless pipelines, an interpenetrating network self-healing polyurethane was first prepared. Octafluoro-1,6-hexanediol and acryloyl chloride were reacted, and the hydroxyl group on octafluoro-1,6-hexanediol reacted with the acyl chloride group on acryloyl chloride, and an olefin group was introduced at the same time to obtain a divinyl fluorine-containing crosslinker. Then, polytetramethylene glycol and isophorone diisocyanate were used as polymerization monomers, and 2,2'-diaminodiphenyl disulfide was used as a chain extender to provide a dynamic disulfide bond to obtain a self-healing polyurethane emulsion. Then, methyl methacrylate, butyl acrylate, and a divinyl fluorine-containing crosslinker were added to the self-healing polyurethane emulsion for polymerization, and a polyacrylate structure was introduced into the polyurethane structure to form a self-healing polyurethane emulsion. The interpenetrating network structure is formed to obtain an interpenetrating network self-repairing polyurethane; the interpenetrating network self-repairing polyurethane has a high degree of cross-linking, and the high cross-linking structure gives it excellent mechanical properties, so that it can resist damage to parts caused by various deformations and impacts during use, and can also improve its density and thus improve its water resistance and weather resistance. The dynamic disulfide bonds in the molecular structure of the interpenetrating network self-repairing polyurethane give it self-repairing ability. When microcracks appear in the material, it can automatically repair itself and extend its service life. The large number of fluorine atoms in the molecular structure of the interpenetrating network self-repairing polyurethane can enhance its chemical corrosion resistance, effectively prevent erosion by corrosive media, and thus improve the stability of the repair material in complex chemical environments.

[0036] In the process of preparing a flexible repair material for trenchless pipelines, a polydopamine-coated molybdenum disulfide nanosheet was also prepared. The molybdenum disulfide nanosheet was prepared using ammonium molybdate and thiourea as raw materials. Then, a polydopamine coating layer was self-polymerized on the surface of the molybdenum disulfide nanosheet to obtain a polydopamine-coated molybdenum disulfide nanosheet. The layered structure of the molybdenum disulfide nanosheet can form an effective barrier in the repair material, preventing the corrosive medium from eroding the repair material, which helps to improve the service life and performance of the repair material. In addition, due to its layered structure, the molybdenum disulfide nanosheet can slide relative to each other, giving it good lubrication and excellent wear resistance, thereby reducing wear and friction and further improving the service life and performance of the repair material. After being coated with polydopamine, the good adhesion of the polydopamine layer enables the molybdenum disulfide nanosheet to bond well with the repair material, improving the interfacial bonding strength between the two, ensuring that the molybdenum disulfide nanosheet is tightly combined with the repair material, uniformly and significantly improving the performance of the repair material, and ensuring the stable performance of the repair material during long-term use. DETAILED DESCRIPTION

[0037] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] Example 1:

[0039] This embodiment is a method for preparing a flexible repair material for a trenchless pipeline, comprising the following steps:

[0040] Step S1: 10 mmol of octafluoro-1,6-hexanediol, 25 mmol of triethylamine and 70 mL of anhydrous acetone were added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and the mixture was stirred at a temperature of -10°C and a stirring rate of 200 r / min for 20 minutes. Then, 20 mL of an acryloyl chloride solution dissolved in anhydrous acetone at a ratio of 10 mmol:10 mL was added dropwise while stirring, and the dropping rate was controlled to be 1 drop / s. After the addition was completed, the mixture was heated to 5°C and the stirring reaction was continued for 2 hours, and then the mixture was heated to 30°C and the stirring reaction was continued for 4 hours. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation. The product was then washed with distilled water twice and extracted with dichloromethane twice. The extracts were combined and the solvent was removed by rotary evaporation to obtain a divinyl fluorine-containing crosslinker.

[0041] Step S2: 20 g of polytetramethylene glycol PTMG-1000, 11 g of isophorone diisocyanate, 0.05 g of dibutyltin dilaurate and 30 mL of N, N-dimethylacetamide were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred and reacted for 10 min at a temperature of 25 ° C and a stirring rate of 200 r / min. The mixture was then heated to 60 ° C and stirred for 1 h, and then heated to 80 ° C and stirred for 2 h. 3 g of 2,2'-diaminodiphenyl disulfide was added and stirred for 1 h. The mixture was then cooled to 40 ° C and triethylamine was added to adjust the pH to 6. Deionized water was then added and stirred for 40 min, and the solid content was adjusted to 40% to obtain a self-repairing polyurethane emulsion.

[0042] Step S3: 90g of self-healing polyurethane emulsion, 7g of methyl methacrylate, 12g of butyl acrylate, 0.5g of divinyl fluorine-containing crosslinker, and 1g of SDS emulsifier and NP-10 emulsifier in a mass ratio of 1:2 were added to a three-necked flask equipped with a stirrer and a thermometer, and stirred for reaction at a temperature of 25°C and a stirring rate of 200r / min for 10min, then heated to 70°C and continued to stir and react for 1h, then 0.3g of azobisisobutyronitrile was added and continued to stir and react for 6h. After the reaction, the reaction product was cooled to room temperature, poured into a mold, and then placed in a vacuum drying oven and dried at a temperature of 60°C for 6h to obtain an interpenetrating network self-healing polyurethane;

[0043] Step S4: 2.47 g of ammonium molybdate, 4.56 g of thiourea and 50 mL of deionized water were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 25 ° C and a stirring rate of 200 r / min for 20 minutes, and then the mixture was heated to 200 ° C and continued to stir for 15 hours. After the reaction, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed twice with distilled water and anhydrous ethanol in sequence, and then placed in a vacuum drying oven and dried at 60 ° C for 3 hours to obtain molybdenum disulfide nanosheets;

[0044] Step S5: 1 g of molybdenum disulfide nanosheets and 90 mL of a Tris-HCl buffer solution with a molar concentration of 1 mol / L and a pH of 8.5 were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 25° C. and a stirring rate of 200 r / min for 20 min. Then, 0.4 g of dopamine hydrochloride was added and the stirring reaction was continued for 25 h. After the reaction was completed, the reaction product was centrifuged, and the precipitate was washed twice with distilled water, and then placed in a vacuum drying oven and dried at 60° C. for 3 h to obtain polydopamine-coated molybdenum disulfide nanosheets;

[0045] Step S6: Weigh 40 parts of interpenetrating network self-healing polyurethane, 5 parts of epoxy resin, 2 parts of polydopamine-coated molybdenum disulfide nanosheets, 2 parts of plasticizer, 1 part of talc, 0.5 parts of antioxidant, and 0.3 parts of ultraviolet absorber according to weight parts, and set aside; the epoxy resin is epoxy resin E-51; the plasticizer is dioctyl phthalate; the antioxidant is antioxidant 168; and the ultraviolet absorber is ultraviolet absorber UV-329;

[0046] Step S7: Add interpenetrating network self-healing polyurethane, epoxy resin, polydopamine-coated molybdenum disulfide nanosheets, plasticizer, talc, antioxidant and ultraviolet absorber into a mixer, stir and mix at a temperature of 25°C and a stirring rate of 800 r / min for 20 minutes to obtain a flexible repair material for non-excavation pipelines.

[0047] Example 2:

[0048] This embodiment is a method for preparing a flexible repair material for a trenchless pipeline, comprising the following steps:

[0049] Step S1: 10 mmol of octafluoro-1,6-hexanediol, 28 mmol of triethylamine and 75 mL of anhydrous acetone were added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and the mixture was stirred at a temperature of -5°C and a stirring rate of 250 r / min for 25 minutes. Then, 21 mL of acryloyl chloride solution dissolved in anhydrous acetone at a ratio of 10 mmol:10 mL was added dropwise while stirring, and the dropping rate was controlled to be 1 drop / s. After the addition was completed, the mixture was heated to 8°C and the stirring reaction was continued for 2.5 hours. Then, the mixture was heated to 32°C and the stirring reaction was continued for 4.5 hours. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation. The mixture was then washed with distilled water twice and extracted with dichloromethane twice. The extracts were combined and the solvent was removed by rotary evaporation to obtain a divinyl fluorine-containing crosslinker.

[0050] Step S2: 22 g of polytetramethylene glycol PTMG-1000, 12 g of isophorone diisocyanate, 0.1 g of dibutyltin dilaurate and 32 mL of N, N-dimethylacetamide were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred and reacted for 15 min at a temperature of 28 ° C and a stirring rate of 250 r / min. The mixture was then heated to 62 ° C and stirred for 1.5 h, and then heated to 82 ° C and stirred for 2.5 h. 5 g of 2,2'-diaminodiphenyl disulfide was added and stirred for 1.5 h. The mixture was then cooled to 42 ° C and triethylamine was added to adjust the pH to 6. Deionized water was then added and stirred for 45 min, and the solid content was adjusted to 40% to obtain a self-repairing polyurethane emulsion.

[0051] Step S3: 95g of self-healing polyurethane emulsion, 9g of methyl methacrylate, 14g of butyl acrylate, 2.5g of divinyl fluorine-containing crosslinker, and 2g of SDS emulsifier and NP-10 emulsifier in a mass ratio of 1:2 were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at a temperature of 28°C and a stirring rate of 250r / min for 15min, and then the mixture was heated to 72°C and stirred for 1.5h. Then, 0.4g of azobisisobutyronitrile was added and the stirring reaction was continued for 7h. After the reaction, the reaction product was cooled to room temperature and then poured into a mold. Then, the mixture was placed in a vacuum drying oven and dried at a temperature of 62°C for 8h to obtain an interpenetrating network self-healing polyurethane;

[0052] Step S4: 2.47 g of ammonium molybdate, 4.56 g of thiourea and 55 mL of deionized water were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 28 ° C. and a stirring rate of 250 r / min for 25 minutes. The mixture was then heated to 210 ° C. and stirred for 18 hours. After the reaction, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed twice with distilled water and anhydrous ethanol in sequence, and then placed in a vacuum drying oven and dried at 62 ° C. for 4 hours to obtain molybdenum disulfide nanosheets;

[0053] Step S5: 1 g of molybdenum disulfide nanosheets and 95 mL of a Tris-HCl buffer solution with a molar concentration of 1 mol / L and a pH of 8.5 were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 28° C. and a stirring rate of 250 r / min for 25 minutes. Then, 0.45 g of dopamine hydrochloride was added and the stirring reaction was continued for 28 hours. After the reaction was completed, the reaction product was centrifuged, and the precipitate was washed twice with distilled water, and then placed in a vacuum drying oven and dried at 62° C. for 4 hours to obtain polydopamine-coated molybdenum disulfide nanosheets;

[0054] Step S6: Weigh 45 parts of interpenetrating network self-healing polyurethane, 6 parts of epoxy resin, 7 parts of polydopamine-coated molybdenum disulfide nanosheets, 4 parts of plasticizer, 3 parts of talc, 1 part of antioxidant, and 0.4 parts of ultraviolet absorber in parts by weight for later use; the epoxy resin is epoxy resin E-51; the plasticizer is dioctyl phthalate; the antioxidant is antioxidant 168; and the ultraviolet absorber is ultraviolet absorber UV-329;

[0055] Step S7: Add interpenetrating network self-healing polyurethane, epoxy resin, polydopamine-coated molybdenum disulfide nanosheets, plasticizer, talc, antioxidant and ultraviolet absorber into a mixer, stir and mix at a temperature of 28°C and a stirring rate of 900 r / min for 25 minutes to obtain a flexible repair material for non-excavation pipelines.

[0056] Example 3:

[0057] This embodiment is a method for preparing a flexible repair material for a trenchless pipeline, comprising the following steps:

[0058] Step S1: 10 mmol of octafluoro-1,6-hexanediol, 30 mmol of triethylamine and 80 mL of anhydrous acetone were added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and the mixture was stirred at 0°C and a stirring rate of 300 r / min for 30 minutes. Then, 22 mL of acryloyl chloride solution dissolved in anhydrous acetone at a ratio of 10 mmol:10 mL was added dropwise while stirring, and the dropping rate was controlled to be 2 drops / s. After the addition was completed, the mixture was heated to 10°C and the stirring reaction was continued for 3 hours, and then the mixture was heated to 35°C and the stirring reaction was continued for 5 hours. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation. The product was then washed with distilled water 3 times and extracted with dichloromethane 3 times. The extracts were combined and the solvent was removed by rotary evaporation to obtain a divinyl fluorine-containing crosslinker.

[0059] Step S2: 25 g of polytetramethylene glycol PTMG-1000, 13 g of isophorone diisocyanate, 0.15 g of dibutyltin dilaurate and 35 mL of N, N-dimethylacetamide were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred and reacted for 20 min at a temperature of 30 ° C and a stirring rate of 300 r / min. The mixture was then heated to 65 ° C and stirred for 2 h, and then heated to 85 ° C and stirred for 3 h. 7 g of 2,2'-diaminodiphenyl disulfide was added and stirred for 2 h. The mixture was then cooled to 45 ° C and triethylamine was added to adjust the pH to 6.5. Deionized water was then added and stirred for 50 min, and the solid content was adjusted to 40% to obtain a self-repairing polyurethane emulsion.

[0060] Step S3: 100g of self-healing polyurethane emulsion, 11g of methyl methacrylate, 16g of butyl acrylate, 4.5g of divinyl fluorine-containing crosslinker, and 3g of SDS emulsifier and NP-10 emulsifier in a mass ratio of 1:2 are added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture is stirred and reacted at a temperature of 30°C and a stirring rate of 300r / min for 20min, then the mixture is heated to 75°C and the stirring reaction is continued for 2h, and then 0.5g of azobisisobutyronitrile is added and the stirring reaction is continued for 8h. After the reaction is completed, the reaction product is cooled to room temperature and then poured into a mold, and then placed in a vacuum drying oven and dried at a temperature of 65°C for 12h to obtain an interpenetrating network self-healing polyurethane;

[0061] Step S4: 2.47 g of ammonium molybdate, 4.56 g of thiourea and 60 mL of deionized water were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 30 ° C and a stirring rate of 300 r / min for 30 minutes, and then the temperature was raised to 220 ° C and the stirring reaction was continued for 20 hours. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with distilled water and anhydrous ethanol three times in sequence, and then placed in a vacuum drying oven and dried at 65 ° C for 5 hours to obtain molybdenum disulfide nanosheets;

[0062] Step S5: 1 g of molybdenum disulfide nanosheets and 100 mL of Tris-HCl buffer solution with a molar concentration of 1 mol / L and a pH of 8.5 were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 30° C. and a stirring rate of 300 r / min for 30 min. Then, 0.5 g of dopamine hydrochloride was added and the stirring reaction was continued for 30 h. After the reaction was completed, the reaction product was centrifuged, and the precipitate was washed with distilled water 3 times, and then placed in a vacuum drying oven and dried at 65° C. for 5 h to obtain polydopamine-coated molybdenum disulfide nanosheets;

[0063] Step S6: Weigh 50 parts of interpenetrating network self-healing polyurethane, 7 parts of epoxy resin, 12 parts of polydopamine-coated molybdenum disulfide nanosheets, 6 parts of plasticizer, 5 parts of talc, 1.5 parts of antioxidant, and 0.5 parts of ultraviolet absorber according to weight parts, and set aside; the epoxy resin is epoxy resin E-51; the plasticizer is dioctyl phthalate; the antioxidant is antioxidant 168; and the ultraviolet absorber is ultraviolet absorber UV-329;

[0064] Step S7: Add interpenetrating network self-healing polyurethane, epoxy resin, polydopamine-coated molybdenum disulfide nanosheets, plasticizer, talc, antioxidant and ultraviolet absorber into a mixer, stir and mix for 30 minutes at a temperature of 30°C and a stirring rate of 1000 r / min to obtain a flexible repair material for non-excavation pipelines.

[0065] Comparative Example 1:

[0066] This comparative example is a method for preparing a flexible repair material for a trenchless pipeline, comprising the following steps:

[0067] Step S1: 25 g of polytetramethylene glycol PTMG-1000, 13 g of isophorone diisocyanate, 0.15 g of dibutyltin dilaurate and 35 mL of N, N-dimethylacetamide were added to a three-necked flask equipped with a stirrer and a thermometer, and stirred for reaction at a temperature of 30 ° C and a stirring rate of 300 r / min for 20 minutes, then heated to 65 ° C and continued to stir and react for 2 hours, then heated to 85 ° C and continued to stir and react for 3 hours, then added 7 g of 2,2'-diaminodiphenyl disulfide and continued to stir and react for 2 hours, then cooled to 45 ° C and triethylamine was added to adjust the pH to 6.5, then deionized water was added and continued to stir and react for 50 minutes, and the solid content was adjusted to 40% to obtain a self-repairing polyurethane emulsion;

[0068] Step S2: pouring 100 g of the self-repairing polyurethane emulsion into a mold, and then placing it in a vacuum drying oven and drying it at 65° C. for 12 h to obtain a self-repairing polyurethane;

[0069] Step S3: Weigh 50 parts of self-repairing polyurethane, 6 parts of plasticizer, 5 parts of talc, 1.5 parts of antioxidant, and 0.5 parts of ultraviolet absorber according to weight parts, and set aside; the plasticizer is dioctyl phthalate; the antioxidant is antioxidant 168; and the ultraviolet absorber is ultraviolet absorber UV-329;

[0070] Step S4: Add the self-repairing polyurethane, plasticizer, talc, antioxidant and ultraviolet absorber into a mixer, stir and mix for 30 minutes at a temperature of 30° C. and a stirring rate of 1000 r / min to obtain a flexible repair material for trenchless pipelines.

[0071] Comparative Example 2:

[0072] This comparative example is a method for preparing a flexible repair material for a trenchless pipeline, comprising the following steps:

[0073] Step S1: 25 g of polytetramethylene glycol PTMG-1000, 13 g of isophorone diisocyanate, 0.15 g of dibutyltin dilaurate and 35 mL of N, N-dimethylacetamide were added to a three-necked flask equipped with a stirrer and a thermometer, and stirred for reaction at a temperature of 30 ° C and a stirring rate of 300 r / min for 20 minutes, then heated to 65 ° C and continued to stir and react for 2 hours, then heated to 85 ° C and continued to stir and react for 3 hours, then added 7 g of 2,2'-diaminodiphenyl disulfide and continued to stir and react for 2 hours, then cooled to 45 ° C and triethylamine was added to adjust the pH to 6.5, then deionized water was added and continued to stir and react for 50 minutes, and the solid content was adjusted to 40% to obtain a self-repairing polyurethane emulsion;

[0074] Step S2: 100 g of self-healing polyurethane emulsion, 11 g of methyl methacrylate, 16 g of butyl acrylate, and 3 g of SDS emulsifier and NP-10 emulsifier in a mass ratio of 1:2 were added to a three-necked flask equipped with a stirrer and a thermometer, and stirred for reaction at a temperature of 30 ° C and a stirring rate of 300 r / min for 20 minutes, then heated to 75 ° C and continued to stir and react for 2 hours, and then 0.5 g of azobisisobutyronitrile was added and continued to stir and react for 8 hours. After the reaction was completed, the reaction product was cooled to room temperature and then poured into a mold, and then placed in a vacuum drying oven and dried at a temperature of 65 ° C for 12 hours to obtain an interpenetrating network self-healing polyurethane;

[0075] Step S3: Weigh 50 parts of interpenetrating network self-healing polyurethane, 6 parts of plasticizer, 5 parts of talc, 1.5 parts of antioxidant, and 0.5 parts of ultraviolet absorber according to weight parts, and set aside; the plasticizer is dioctyl phthalate; the antioxidant is antioxidant 168; and the ultraviolet absorber is ultraviolet absorber UV-329;

[0076] Step S4: Add interpenetrating network self-healing polyurethane, plasticizer, talc, antioxidant and ultraviolet absorber into a mixer, stir and mix for 30 minutes at a temperature of 30°C and a stirring rate of 1000 r / min to obtain a flexible repair material for non-excavation pipelines.

[0077] Comparative Example 3:

[0078] This comparative example is a method for preparing a flexible repair material for a trenchless pipeline, comprising the following steps:

[0079] Step S1: 10 mmol of octafluoro-1,6-hexanediol, 30 mmol of triethylamine and 80 mL of anhydrous acetone were added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and the mixture was stirred at 0°C and a stirring rate of 300 r / min for 30 minutes. Then, 22 mL of acryloyl chloride solution dissolved in anhydrous acetone at a ratio of 10 mmol:10 mL was added dropwise while stirring, and the dropping rate was controlled to be 2 drops / s. After the addition was completed, the mixture was heated to 10°C and the stirring reaction was continued for 3 hours, and then the mixture was heated to 35°C and the stirring reaction was continued for 5 hours. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation. The product was then washed with distilled water 3 times and extracted with dichloromethane 3 times. The extracts were combined and the solvent was removed by rotary evaporation to obtain a divinyl fluorine-containing crosslinker.

[0080] Step S2: 25 g of polytetramethylene glycol PTMG-1000, 13 g of isophorone diisocyanate, 0.15 g of dibutyltin dilaurate and 35 mL of N, N-dimethylacetamide were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred and reacted for 20 min at a temperature of 30 ° C and a stirring rate of 300 r / min. The mixture was then heated to 65 ° C and stirred for 2 h, and then heated to 85 ° C and stirred for 3 h. 7 g of 2,2'-diaminodiphenyl disulfide was added and stirred for 2 h. The mixture was then cooled to 45 ° C and triethylamine was added to adjust the pH to 6.5. Deionized water was then added and stirred for 50 min, and the solid content was adjusted to 40% to obtain a self-repairing polyurethane emulsion.

[0081] Step S3: 100g of self-healing polyurethane emulsion, 11g of methyl methacrylate, 16g of butyl acrylate, 4.5g of divinyl fluorine-containing crosslinker, and 3g of SDS emulsifier and NP-10 emulsifier in a mass ratio of 1:2 are added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture is stirred and reacted at a temperature of 30°C and a stirring rate of 300r / min for 20min, then the mixture is heated to 75°C and the stirring reaction is continued for 2h, and then 0.5g of azobisisobutyronitrile is added and the stirring reaction is continued for 8h. After the reaction is completed, the reaction product is cooled to room temperature and then poured into a mold, and then placed in a vacuum drying oven and dried at a temperature of 65°C for 12h to obtain an interpenetrating network self-healing polyurethane;

[0082] Step S4: Weigh 50 parts of interpenetrating network self-healing polyurethane, 6 parts of plasticizer, 5 parts of talc, 1.5 parts of antioxidant, and 0.5 parts of ultraviolet absorber according to weight parts, and set aside; the plasticizer is dioctyl phthalate; the antioxidant is antioxidant 168; and the ultraviolet absorber is ultraviolet absorber UV-329;

[0083] Step S5: Add interpenetrating network self-repairing polyurethane, plasticizer, talc, antioxidant and ultraviolet absorber into a mixer, stir and mix for 30 minutes at a temperature of 30°C and a stirring rate of 1000 r / min to obtain a flexible repair material for non-excavation pipelines.

[0084] Comparative Example 4:

[0085] This comparative example is a method for preparing a flexible repair material for a trenchless pipeline, comprising the following steps:

[0086] Step S1: 10 mmol of octafluoro-1,6-hexanediol, 30 mmol of triethylamine and 80 mL of anhydrous acetone were added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and the mixture was stirred at 0°C and a stirring rate of 300 r / min for 30 minutes. Then, 22 mL of acryloyl chloride solution dissolved in anhydrous acetone at a ratio of 10 mmol:10 mL was added dropwise while stirring, and the dropping rate was controlled to be 2 drops / s. After the addition was completed, the mixture was heated to 10°C and the stirring reaction was continued for 3 hours, and then the mixture was heated to 35°C and the stirring reaction was continued for 5 hours. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation. The product was then washed with distilled water 3 times and extracted with dichloromethane 3 times. The extracts were combined and the solvent was removed by rotary evaporation to obtain a divinyl fluorine-containing crosslinker.

[0087] Step S2: 25 g of polytetramethylene glycol PTMG-1000, 13 g of isophorone diisocyanate, 0.15 g of dibutyltin dilaurate and 35 mL of N, N-dimethylacetamide were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred and reacted for 20 min at a temperature of 30 ° C and a stirring rate of 300 r / min. The mixture was then heated to 65 ° C and stirred for 2 h, and then heated to 85 ° C and stirred for 3 h. 7 g of 2,2'-diaminodiphenyl disulfide was added and stirred for 2 h. The mixture was then cooled to 45 ° C and triethylamine was added to adjust the pH to 6.5. Deionized water was then added and stirred for 50 min, and the solid content was adjusted to 40% to obtain a self-repairing polyurethane emulsion.

[0088] Step S3: 100g of self-healing polyurethane emulsion, 11g of methyl methacrylate, 16g of butyl acrylate, 4.5g of divinyl fluorine-containing crosslinker, and 3g of SDS emulsifier and NP-10 emulsifier in a mass ratio of 1:2 are added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture is stirred and reacted at a temperature of 30°C and a stirring rate of 300r / min for 20min, then the mixture is heated to 75°C and the stirring reaction is continued for 2h, and then 0.5g of azobisisobutyronitrile is added and the stirring reaction is continued for 8h. After the reaction is completed, the reaction product is cooled to room temperature and then poured into a mold, and then placed in a vacuum drying oven and dried at a temperature of 65°C for 12h to obtain an interpenetrating network self-healing polyurethane;

[0089] Step S4: Weigh 50 parts of interpenetrating network self-healing polyurethane, 7 parts of epoxy resin, 6 parts of plasticizer, 5 parts of talc, 1.5 parts of antioxidant, and 0.5 parts of ultraviolet absorber according to weight parts, and set aside; the epoxy resin is epoxy resin E-51; the plasticizer is dioctyl phthalate; the antioxidant is antioxidant 168; and the ultraviolet absorber is ultraviolet absorber UV-329;

[0090] Step S5: Add interpenetrating network self-healing polyurethane, epoxy resin, plasticizer, talcum powder, antioxidant and ultraviolet absorber into a mixer, stir and mix for 30 minutes at a temperature of 30°C and a stirring rate of 1000 r / min to obtain a flexible repair material for non-excavation pipelines.

[0091] Comparative Example 5:

[0092] This comparative example is a method for preparing a flexible repair material for a trenchless pipeline, comprising the following steps:

[0093] Step S1: 10 mmol of octafluoro-1,6-hexanediol, 30 mmol of triethylamine and 80 mL of anhydrous acetone were added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and the mixture was stirred at 0°C and a stirring rate of 300 r / min for 30 minutes. Then, 22 mL of acryloyl chloride solution dissolved in anhydrous acetone at a ratio of 10 mmol:10 mL was added dropwise while stirring, and the dropping rate was controlled to be 2 drops / s. After the addition was completed, the mixture was heated to 10°C and the stirring reaction was continued for 3 hours, and then the mixture was heated to 35°C and the stirring reaction was continued for 5 hours. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation. The product was then washed with distilled water 3 times and extracted with dichloromethane 3 times. The extracts were combined and the solvent was removed by rotary evaporation to obtain a divinyl fluorine-containing crosslinker.

[0094] Step S2: 25 g of polytetramethylene glycol PTMG-1000, 13 g of isophorone diisocyanate, 0.15 g of dibutyltin dilaurate and 35 mL of N, N-dimethylacetamide were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred and reacted for 20 min at a temperature of 30 ° C and a stirring rate of 300 r / min. The mixture was then heated to 65 ° C and stirred for 2 h, and then heated to 85 ° C and stirred for 3 h. 7 g of 2,2'-diaminodiphenyl disulfide was added and stirred for 2 h. The mixture was then cooled to 45 ° C and triethylamine was added to adjust the pH to 6.5. Deionized water was then added and stirred for 50 min, and the solid content was adjusted to 40% to obtain a self-repairing polyurethane emulsion.

[0095] Step S3: 100g of self-healing polyurethane emulsion, 11g of methyl methacrylate, 16g of butyl acrylate, 4.5g of divinyl fluorine-containing crosslinker, and 3g of SDS emulsifier and NP-10 emulsifier in a mass ratio of 1:2 are added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture is stirred and reacted at a temperature of 30°C and a stirring rate of 300r / min for 20min, then the mixture is heated to 75°C and the stirring reaction is continued for 2h, and then 0.5g of azobisisobutyronitrile is added and the stirring reaction is continued for 8h. After the reaction is completed, the reaction product is cooled to room temperature and then poured into a mold, and then placed in a vacuum drying oven and dried at a temperature of 65°C for 12h to obtain an interpenetrating network self-healing polyurethane;

[0096] Step S4: 2.47 g of ammonium molybdate, 4.56 g of thiourea and 60 mL of deionized water were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 30 ° C and a stirring rate of 300 r / min for 30 minutes, and then the temperature was raised to 220 ° C and the stirring reaction was continued for 20 hours. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with distilled water and anhydrous ethanol three times in sequence, and then placed in a vacuum drying oven and dried at 65 ° C for 5 hours to obtain molybdenum disulfide nanosheets;

[0097] Step S5: 1 g of molybdenum disulfide nanosheets and 100 mL of Tris-HCl buffer solution with a molar concentration of 1 mol / L and a pH of 8.5 were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 30° C. and a stirring rate of 300 r / min for 30 min. Then, 0.5 g of dopamine hydrochloride was added and the stirring reaction was continued for 30 h. After the reaction was completed, the reaction product was centrifuged, and the precipitate was washed with distilled water 3 times, and then placed in a vacuum drying oven and dried at 65° C. for 5 h to obtain polydopamine-coated molybdenum disulfide nanosheets;

[0098] Step S6: Weigh 50 parts of interpenetrating network self-healing polyurethane, 12 parts of polydopamine-coated molybdenum disulfide nanosheets, 6 parts of plasticizer, 5 parts of talc, 1.5 parts of antioxidant, and 0.5 parts of ultraviolet absorber according to weight parts, and set aside; the plasticizer is dioctyl phthalate; the antioxidant is antioxidant 168; and the ultraviolet absorber is ultraviolet absorber UV-329;

[0099] Step S7: Add interpenetrating network self-healing polyurethane, polydopamine-coated molybdenum disulfide nanosheets, plasticizer, talc, antioxidant and ultraviolet absorber into a mixer, stir and mix for 30 minutes at a temperature of 30°C and a stirring rate of 1000 r / min to obtain a flexible repair material for non-excavation pipelines.

[0100] The tensile strength of the flexible repair materials for trenchless pipelines of Examples 1-3 and Comparative Examples 1-5 was tested according to GB / T 1040-2006. The test results are shown in the following table:

[0101]

[0102] Referring to the data in the above table, based on the comparison between Examples 1-3 and Comparative Examples 1-5, it can be seen that the flexible repair material for non-excavation pipelines of the present application has excellent mechanical properties and corrosion resistance.

[0103] The acid resistance retention rate = (tensile properties after acid treatment / tensile properties before treatment) × 100%. The acid treatment method is as follows: immerse the sample in a 10% by mass sulfuric acid solution for 15 days, then take it out, wash it with distilled water three times, and test it after drying.

[0104] Among them, the alkali resistance retention rate = (tensile properties after alkali treatment / tensile properties before treatment) × 100%; the alkali treatment method is: immerse the sample in a 10% by mass sodium hydroxide solution for 15 days, then take it out and wash it with distilled water three times, and then dry it before testing.

[0105] Among them, the salt resistance retention rate = (tensile properties after salt treatment / tensile properties before treatment) × 100%; the salt treatment method is: immerse the sample in a 10% by mass sodium chloride solution for 15 days, then take it out and wash it with distilled water three times, and then test it after drying.

[0106] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0107] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined in this application, they should all fall within the scope of protection of the present invention.

Claims

1. A flexible repair material for trenchless pipelines, characterized in that: It comprises the following components in parts by weight: 40-50 parts of interpenetrating network self-healing polyurethane, 5-7 parts of epoxy resin, 2-12 parts of polydopamine-coated molybdenum disulfide nanosheets, 2-6 parts of plasticizer, 1-5 parts of talc, 0.5-1.5 parts of antioxidant and 0.3-0.5 parts of ultraviolet absorber; The interpenetrating network self-repairing polyurethane is prepared by the following steps: Step a1: stirring polytetramethylene glycol, isophorone diisocyanate, dibutyltin dilaurate and N,N-dimethylacetamide, then adding 2,2'-diaminodiphenyl disulfide and continuing to stir the reaction, then adding triethylamine to adjust the pH, and then adding deionized water to adjust the solid content to obtain a self-healing polyurethane emulsion; Step a2: stirring and reacting a self-healing polyurethane emulsion, methyl methacrylate, butyl acrylate, a divinyl fluorine-containing crosslinker, and an emulsifier, then adding azobisisobutyronitrile and continuing to stir and react. After the reaction is completed, the reaction product is cooled and then dried to obtain an interpenetrating network self-healing polyurethane; The divinyl fluorine-containing crosslinking agent is prepared by the following steps: Octafluoro-1,6-hexanediol, triethylamine and anhydrous acetone are stirred for reaction, and then acryloyl chloride solution is added and the stirring reaction is continued. After the reaction is completed, the reaction product is cooled, and then rotary evaporated, and then washed and extracted. The extracts are combined and rotary evaporated to obtain a divinyl fluorine-containing crosslinker; The polydopamine-coated molybdenum disulfide nanosheets are prepared by the following steps: Step b1: stirring ammonium molybdate, thiourea and deionized water to react, cooling the reaction product after the reaction is completed, and then centrifuging it, washing and drying the precipitate to obtain molybdenum disulfide nanosheets; Step b2: stirring the molybdenum disulfide nanosheets and Tris-HCl buffer solution to react, then adding dopamine hydrochloride and continuing to stir the reaction. After the reaction is completed, the reaction product is centrifuged, and the precipitate is washed and dried to obtain polydopamine-coated molybdenum disulfide nanosheets.

2. The flexible repair material for trenchless pipelines according to claim 1, characterized in that: The amount ratio of the polytetrahydrofuran diol, isophorone diisocyanate, dibutyltin dilaurate, N,N-dimethylacetamide and 2,2'-diaminodiphenyl disulfide in step a1 is 20-25g:11-13g:0.05-0.15g:30-35mL:3-7g; the polytetrahydrofuran diol is PTMG-1000.

3. The flexible repair material for trenchless pipelines according to claim 1, characterized in that: The amount ratio of the self-healing polyurethane emulsion, methyl methacrylate, butyl acrylate, divinyl fluorine-containing crosslinker, emulsifier and azobisisobutyronitrile in step a2 is 90-100g:7-11g:12-16g:0.5-4.5g:1-3g:0.3-0.5g; the emulsifier is a mixture of SDS emulsifier and NP-10 emulsifier in a mass ratio of 1:

2.

4. The flexible repair material for trenchless pipelines according to claim 1, characterized in that: The usage ratio of octafluoro-1,6-hexanediol, triethylamine, anhydrous acetone and acryloyl chloride solution is 10mmol:25-30mmol:70-80mL:20-22mL; the acryloyl chloride solution is a solution in which acryloyl chloride is dissolved in anhydrous acetone at a ratio of 10mmol:10mL.

5. The flexible repair material for trenchless pipelines according to claim 1, characterized in that: The usage ratio of the ammonium molybdate, thiourea and deionized water in step b1 is 2.47 g:4.56 g:50-60 mL.

6. The flexible repair material for trenchless pipelines according to claim 1, characterized in that: The molybdenum disulfide nanosheets, Tris-HCl buffer solution and dopamine hydrochloride in step b2 are used in a ratio of 1 g:90-100 mL:0.4-0.5 g; the molar concentration of the Tris-HCl buffer solution is 1 mol / L, and the pH is 8.

5.

7. A method for preparing a flexible repair material for a trenchless pipeline according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Weigh 40-50 parts of interpenetrating network self-healing polyurethane, 5-7 parts of epoxy resin, 2-12 parts of polydopamine-coated molybdenum disulfide nanosheets, 2-6 parts of plasticizer, 1-5 parts of talc, 0.5-1.5 parts of antioxidant and 0.3-0.5 parts of ultraviolet absorber according to weight parts and set aside; Step 2: Add interpenetrating network self-healing polyurethane, epoxy resin, polydopamine-coated molybdenum disulfide nanosheets, plasticizer, talc, antioxidant and ultraviolet absorber into a mixer, stir and react for 20-30 minutes at a temperature of 25-30°C and a stirring rate of 800-1000r / min to obtain a flexible repair material for non-excavation pipelines.

8. The method for preparing a flexible repair material for a trenchless pipeline according to claim 7, characterized in that: The epoxy resin is epoxy resin E-51; The plasticizer is dioctyl phthalate; The antioxidant is antioxidant 168; The ultraviolet absorber is ultraviolet absorber UV-329.

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